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References:

Rütenbrock 6 Z b: Re-entry gas well (sidetrack; 3800 m TD), Drilling Engineering, Tendering, Drilling Operations Management for Wintershall

Ratzel Z 1 b: Re-entry gas well (sidetrack through 2 casing strings; 2470 m TD), Drilling Engineering, Tendering, Drilling Operations Management for Preussag Energie

Leer Z 3 a: Sidetrack of deep gas well (sidetrack through 2 casing strings; 4690 m TD), Drilling Engineering, Tendering, Drilling Operations Management for Preussag Energie

Gas-Storage Kalle: 2 storage wells: (horizontal wells; 2355m resp. 2460 m TD), Drilling Consulting, Drilling Operations Management for VEW Energie

Gas-Storage Kalle: Re-evaluation of existing wells concerning cementing quality and performance (part of an investigational study of possible storage leaks) for VEW Energie

Gas-Storage Kalle: Monitoring well on gas storage; Drilling Engineering for RWE /ESK

Gas-Storage Kalle: Sidetrack of an existing storage well; Bohrtechnische Drilling Engineering for RWE /ESK (in progress)

Japanese Ultra-deep Drilling and Geoscientific Experiments Project (JUDGE): Contribution of Chapters (Evaluation of KTB-experience, recommendations for proceeding in JUDGE-project) to feasibility-study with international participation for Japanese Geological Survey/Japanese Metal and Chemical Corporation (JMC)

Rieth 1: Re-evaluation of a casing 2-stage cementation (part of an investigation of potential hazards of a CBM-project for CONOCO)

San Andreas Fault Zone Drilling Project: Evaluation of  drilling concept , budgeting for GeoForschungs-Zentrum Potsdam (GFZ)

Volkenroda FL Vo 97: Flooding well for old potassium mine (directional well, 4 m target, 1007 m TD), drilling engineering, -operations  supervision and management for GVV

Cavern Storage Teutschenthal: 4 cavern wells (3 wells for new caverns, 1 in existing cavern; 800 - 1200 m TD):  drilling operations supervision and management for BSL

Cavern Storage Project ”Reckrod”: Drilling of 4 new wells, and completion of  2 old wells: Drilling consulting for GASUNION and PLE/Daldrup, participation in tendering

Study ”Investigation of Multi-Lateral Drilling & Completion-Technique as a Possible Alternative to Frac-Treatment in Deep Tight Gas Reservoirs” for Wintershall

Study ”Evaluation of Alternative Well Design Concepts for Deep Gas Wells in the Emsland-Area” for Wintershall (well with alternative design was successfully  implemented in late 1997)

Cavern Storage Ohrensen: 3 new wells: Drilling consulting for DOW Deutschland Inc.

Gas Storage Bierwang: ”Feasibility of  Storage-Improvement by a Horizontal Side-Track of an Existing Well”: Participation in elaboration of  study for Ruhrgas/PLE (elaboration of drilling related part)

Gas Storage Bierwang: New storage well: Drilling consulting (trouble shooting) for Ruhrgas/PLE

Study ”Feasibilty of Investigating the Geology for a Planned High-Speed Train Tunnel below a Disposal Ground by Drilling a 600 m Long Horizontal Well” for ATAC/DMT (elaboration of drilling related part)

Verden Ost Z 1: Evaluation of different feasible technical alternatives, elaboration of complete technical detailed planning for Wintershall

Emtinghausen West Z 1: Evaluation of feasible technical alternatives, drilling engineering for Wintershall

Barrien 5T a: Feasibility Study of a ”Minimum Cost Sidetrack” for Wintershall

Prinos PA-29: Sidetrack of an existing production well (2 targets), feasibility-study, drilling engineering, supervision for Kavala Oil S.A., Greece

Prinos PA-30: Sidetrack of an existing production well (4 targets), feasibility-study, drilling engineering, supervision for Kavala Oil S.A., Greece

Prinos PA-31: Sidetrack of an existing production well (4 targets), drilling engineering, project management & supervision for Kavala Oil S.A., Greece

Prinos North H2: Sidetrack of an existing production well, feasibility-study for 800 m horizontal hole in payzone, drilling engineering for Kavala Oil S.A., Greece

Prinos Epsilon 1/1a: Drilling engineering of exploration well aqnd geological sidetrack for Kavala Oil S.A., Greece

Kalirahi 1: Drilling engineering of exploration well for Kavala Oil S.A.

Kalirahi 2: Drilling engineering of exploration well for Kavala Oil S.A.

Georgsdorf 121 a: Drilling engineering for BEB Erdgas & Erdöl GmbH

Peckensen 179 a: Drilling engineering, review of work schedule for EEG Erdgas Erdöl GmbH

Salzwedel 125 a: Drilling engineering, review of work schedule for EEG Erdgas Erdöl GmbH

Salzwedel 132 a: Drilling engineering, review of work schedule for EEG Erdgas Erdöl GmbH

Carrico Gas Storage Project: Re-evaluation of casing cementations for KBB/Transgas

Geothermal Project Bremerhaven TEWS: Drilling-related consulting for the project management of swb Stadtwerke Bremen/Bremerhaven (in progress)

Geothermal Project München-Riem: Drilling-related consulting and engineering for the project management of SWM Stadtwerke München via a joint cooperation with Erdwerk

Study „Lund DGE 1 – Analysis of Technical Situation and possible Reasons for Stuck Pipe” for KCA Deutag Drilling GmbH, Bad Bentheim

Study “Feasibility of Usage and preferred Modifications of existing Wells in a German Gas Storage in Combination with higher Storage Pressure” for RWE-DEA, Hamburg

Investigation “Actual State of and necessary Work on existing Wells of an old Oil- and Gasfield for future Use as Underground Gas Storage” for BEB/EMPG, Hannover

Investigation & Evaluation “Available Safety Factors of the Anchor Casing Strings of the Gaswells in N-Germany” for BEB/EMPG, Hannover

Theoretical Investigation & Evaluation “Investigation of Actual State of Fluids in Annulli and possible Impact on Well Integrity” for ExxonMobil Production Deutschland GmbH (EMPG), Hannover

Investigation & Evaluation “Available Safety Factors of the Anchor Casing Strings of  Gas Storage Wells in Berlin” for GASAG, Berlin

Investigation & Evaluation “Available Safety Factors of the Anchor Casing Strings of selected  Wells in Germany” for  Gaz de France, Production & Exploration Germany, Lingen

Investigation & Evaluation “Available Safety Factors of the Anchor Casing Strings of the Gaswells in N-Germany” for RWE Dea Production Dept. Lower Saxony

Investigation & Evaluation “Available Safety Factors of the Anchor Casing Strings of selected  Gas Storage Wells” for RWE Gas Storage s.r.o., Prague

Gas Storage Project Tschech Republik: Drilling Engineering, consulting and tendering of 12 new wells for RWE Gas Storage s.r.o., Prague

Gas Storage Project UK: Drilling Engineering, consulting and tendering of 10 new wells for RWE Energy AG, Dortmund

Gas Storage Project Austria: Drilling Engineering and consulting for 7 new wells for OMV/Austria

Geothermal Project Offenbach/Queich: Drilling Engineering, consulting and drilling supervision for HOTROCK, Karlsruhe

Geothermal-Projekt Mauerstetten: Drilling Engineering, consulting and tendering for Geothermie Allgäu/EXORKA Intl., München

Geothermal-Project Peiting: Drilling Engineering, consulting and tendering for GreenEnergy, Hannover

Geothermal-Project Taufkirchen: Drilling Engineering, consulting and tendering for Geotec Consult, Markt-Schwaben

Geothermal-Project Erding: Drilling Engineering, consulting and tendering for Geotec Consult, Markt-Schwaben

Geothermal-Project Utting: Drilling Engineering and consulting for Aufwind Schmack GmbH, Regensburg

Geothermal-Project Bernried: Drilling Engineering and consulting for Bernried Erdwärme AG, Bernried

Geothermal-Project „Sonnengarten GTB“ Zürich/CH: Drilling Engineering for Daldrup & Soehne AG, Ascheberg; consulting and project follow-up for ewz Elektizitätswerke Zürich/CH

Geothermal-Project Traunreut: Drilling Engineering, consulting and tendering for Grünwald Equity Geothermie GmbH, Grünwald

Geothermal-Project „Lavey P2300/3000/CH: Drilling Engineering, consulting and tendering for SI-REN SA/Lausanne/CH

Geothermal-Project Schlattingen: Drilling consulting for NAGRA/CH

Geothermal-Project „Rupertiwinkel“: Drilling Engineering, consulting and tendering for Salzburg AG, Salzburg/A

Cavern Storage Project „Nasr Abad“ (Iran): Drilling Engineering and consulting for the 1^st cavern well NSC-01 for Natural Gas Storage Company (NGSC) and DANA Energy, Tehran/Iran

Study „Verrohrungsschema und -design für die Erkundungsbohrungen der Etappe 3 der Nagra Sondierkampagne unter besonderer Berücksichtigung der Seilkerntechnik“: Study for National Cooperative for the Disposal of Radioactive Waste (NAGRA), Switzerland

Geoscientific Exploration Wells on the Diapir-Structure Asse: Drilling consulting for the planned wells for Federal Office for Radiation Protection (BfS), Salzgitter

Several deep geothermal wells: Particular Drilling Engineering for various customers (casing design, T/D-calculations, borehole hydraulics, min. rig requirements, etc.)

Several deep gas wells in NE- Germany: Investigation on Integrity of particular wells for RWE-Dea, Hamburg, and ExxonMobil Production Deutschland GmbH (EMPG), Hannover

Several oilwells in NE-Germany: Preparation of Applications for Mining Authorities and particular drilling engineering work for Central European Petroleum GmbH (CEP)

Numerous Wells On-Shore: Drilling supervision for various customers (Operator Toolpusher), e.g.:

• BEB (various gas- and gas storage wells)
• Preussag Energie (various oil- and gas wells)
• Ruhrgas (gas storage Sandhausen)
• Saarferngas (gas storage Frankenthal)
• VEW Energie (gas storage Kalle)
• Wintershall (gas storage Rehden; oilfield Emlichheim)
• Kavala Oil (oilfield offshore Greece)

Elaboration of an Equipment- und Service-Review Manual as part of a Quality Management System for Optimization of Drilling Projects for the companies BEB, Mobil, OMV, Preussag, RWE-DEA, and Wintershall

Elaboration of a Recommendation for the optimized Use of Drillstring-Connections  under High Combined Loads, with special target to ERD-wells for DEUTAG Europe

Technical Feasibility Study ”Energy- & Fluid Transport in Fault Zones of the Continental Crust at the KTB-Location” for German Research Foundation (DFG)

Several Technical Expertises for various customers (operating companies, service companies, insurances, Mining Authorities,...)

Several Wells On- and Off-Shore: Evaluation of  borehole circulating temperature (BHCT) from circulation experiments before running casing/liner, recommendations for preparing and performing critical cementing jobs

Educational Seminars: Several drilling related courses, held at the ”Drilling School Celle” (e.g. 3 courses for high-level Chinese delegations from The Ministry of Geology and Mineral   Resources, Chinese Academy of Geological Sciences, National Research Center, ...)

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Ing.-Büro Axel Sperber, Gruene Riede 20, D-31234 Edemissen, Tel.: +49 5176-90508, AxelSperber@t-online.de